Which livestock for the 25gallon?

So everything is finally setup and I am just waiting another 1 week at least till my parameters are fully in check to add my CuC. As far as later on down the road these are some of the tank inhabitants I will be looking at. Do you all see any downsides or complications in this list? Its a 20 gallon high by the way.

-Yellow Watchman Goby (or High Fin Banded Goby)
-Pistol Shrimp
-Emerald Crab
-Some sort of blenny (Bi-color likely)
-Skunk Cleaner Shrimp (or maybe a few Peppermint Shrimp)

Out of this list of livestock, which would be the first I should add? I am so sick of aggression issues in my FW tank that I just want a simple and peaceful tank. Territorial issues are fine, i just dont want fish livestock killing each other.

 

you dont want get aggression? dont get two fish that dwell entirely on the bottom of the tank, especially if its a high tank.

I would trade one of those sand-dwellers for a mid-water fish. easy choice is an ocellaris clown. if you want to be more unique, it gets harder to pick.

 

You mean the watchman goby and the blenny? The blenny is a posibility. Im getting a yellow watchman for sure though. Clowns dont seem to fascinate me a lot. They are nice and colorful but is their personality? or do they just wiggle in the water column...